Monoazo dyestuff



ALLAN J. FIELD, OF NEW YORK, N. Y.

FIONOAZO DYESTUFF.

No Drawing. Application filed July 23,

T 0 all whom it may concern:

Be it known that I, ALLAN JAMES FIELD, a subject of the King of GreatBritain, residing in New York city, borough of Manhattan, State of NewYork, hiive invented certain new and useful Improvements in the MonoazoDyestuffs, of which this is a full, clear, and exact specification.

This invention relates to improvements in dyestufls, and to processes ofproducing the same.

By the present invention I produce a new bluish red azo coloring-matterof the .formula:

soma HO N Example: Dissolve about two hundred and twenty-three (223)parts of Q-naphthylamin-l-sulfonic acid in about one thousand- (1000)parts of water and one hundred and eighty-two and one-half (182.5) partsof sodium hydrate containing thirty-five per cent. NaOH. To this add asolution of seventy-four and one-half (74.5) parts sodium nitritecontaining ninety-five per cent. Naxo dissolved in about one hundred andforty-five (145) p'arts of water. The mixed olutions are cooled to 5 C.with ice. This cold liquidis then run into three hundred and fifty-threep rts of hydrochloric acid containing thirty-one per cent. HCl. cooledto 10 C. with an equal amount of ice and water. Stir well while mixingand continue stirring for about 10 minutes; the

Specification of Letters Patent.

Patented July 5, i921.

1918. Serial No. 246,319.

diazo compound separates out as a light reddish yellow precipitate.

The diazo compound is then run into an ice cold solution of about threehundred and be precipitated out of solution with common salt. The drydyestuff forms a dark powder with a metallic copper-like luster. It iseasily soluble in water with bluish-red color. When dissolved insulfuric acid a deep violet-blue solution results. It is soluble inalcohol with a bluish-red color. It is not soluble in benzene. The newdyestufi' dyes silk or wool in an acid bath of bluish-red shade similarto that of azo-fuchsin.

\Vhat I claim as my invention. and desire to secure by Letters atentisAs new product, the dyestuif having the formula:

s03 NH;

N HO 1 W NBO S son's k/\/ obtained by combining diazotized Q-naphthvlamin-1-sulfonic acid w' 1: S amidonaphthol-3-6-disulfonic act, whichis read ily soluble in water w'th a bluish-red color. dissolving inconcen rated sulfuric acid with deep violet blue c 01. dyeing wool andsilk bluish-red shade.

Inwitness whereof, I have hereunto signed my name.

ALLAN .1. FIELD.

